Congratulations on finally getting to the point where all of these questions will actually be put to good use! 8^)
There are a lot of options that would work well for what you want to do. Some better than others. Here is a partial list of options:
Albin Ballad 31:
These are very pretty boats with good sailing manners but are a bit cramped down below. They were very well constructed. They usually have tillers but would need to have a shower added. I have seen them for less than $10K but most are a bit more.
Beneteau First 32 (mid 1980''s): These German Frers designed sloops are actually quite well constructed and offer a very nicely finished and laidout interior for a single person living aboard. The head is aft by the companionway where there is maximum headroom and moisture can be vented.
C&C Corvette (31):
Keel centerboard boats from the late 1960''s they sail well and offer access to shallower venues. Very simple but workable interior. Usually these were tiller steered. Usually asking in the teens.
Chris Craft Cherokee 32:
Chris Craft Capri 31: These S&S designed sloops were designed for the charter trade and were fairly beefy boats.
Well constructed, fractionally rigged performance cruisers with especially nice interior layouts.
Ericson Independence 31:
These are really neat boats that featured tradition topsides and a modern underbody.
Express 30 (Goman Express) These were nicely built Canadian boats that came in two forms, a stripped out race and a cruising version. The cruising version would better suit your needs. In a lot of ways this would be one of the best boats on this list in terms of offer a reasonable live aboard and good performance.
Farr 30: I don''t know this specific boat but Farr designed a number of mid-sized performance cruisers. http://www.yachtworld.com/core/listing/pl_boat_detail.jsp?currency=USD&units=Feet&checked _boats=1174679&slim=quick&
sometimes listed under American Boatbuilding Corporation)These were oldies but goodies. They offered very simple interiors and good construction. They sail very well and you often see them listed in the teens.
Hunter 31: (1980''s)
For all of the Hunter bashing that you see on the internet these were actually pretty good boats that sailed quite well. They would not fall high on my list as an offshore boat but they are reasonable for what you want to do. I can''t recall the head on these boats and I believe that most had wheels.
These boats offer good performance and reasonable accomodations. Their fractional rig makes for good single-handing capabilities.
Pearson 323(late 1970''s early 1980''s)
Simple good cruisers with little pretensions beyond that. They offer a nice interior layout. These are not high performance boats but they well. Usually these are wheel steered.
Palmer-Johnson 30: A close cousin to the Tartan 30 but better constructed.
Pearson 31/32 (early 1980''s):
These evolved from older IOR race boats. The 31 was fractionally rigged and the 32 had a masthead rig. The 31''s were all tiller steered from the factory. The 32s came both ways.
S2 9.1''s: These are more racer than cruiser yet they offer very good sailing ability, lots of room and a reasonably nice layout.
Tartan 30: One of my favorite 30 footers of this era. (The Tartan 300 which replaced the 30 does not appeal to me as much as the 30 but offered a nicer interior.)
This list should be a reasonable starting point for your search. Good hunting....